IDLE: Improve zoomheight doc and behavior.

[terryjreedy]

BPO	37039
Nosy	@terryjreedy, @taleinat, @aroberge, @serhiy-storchaka, @csabella, @miss-islington
PRs	bpo-37039: IDLE - zoomheight fixes #13576 [3.7] bpo-37039: IDLE - zoomheight fixes (GH-13576) #13602 bpo-37039: Make IDLE's Zoom Height adjust to users' screens #13678 [3.7] bpo-37039: Make IDLE's Zoom Height adjust to users' screens (GH-13678) #14167 [3.8] bpo-37039: Make IDLE's Zoom Height adjust to users' screens (GH-13678) #14168
Files	image.png image.png image.png

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = <Date 2019-06-17.20:17:35.114>
created_at = <Date 2019-05-25.01:15:52.063>
labels = ['3.8', 'expert-IDLE', 'type-bug', '3.7', '3.9']
title = 'IDLE: Improve zoomheight doc and behavior.'
updated_at = <Date 2019-06-17.20:32:18.338>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2019-06-17.20:32:18.338>
actor = 'taleinat'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2019-06-17.20:17:35.114>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2019-05-25.01:15:52.063>
creator = 'terry.reedy'
dependencies = []
files = ['48358', '48359', '48360']
hgrepos = []
issue_num = 37039
keywords = ['patch']
message_count = 26.0
messages = ['343450', '343468', '343469', '343490', '343507', '343517', '343518', '343521', '343526', '343528', '343534', '343545', '343565', '343689', '343690', '343702', '343703', '343711', '343751', '343963', '343965', '345891', '345895', '345899', '345900', '345902']
nosy_count = 6.0
nosy_names = ['terry.reedy', 'taleinat', 'aroberge', 'serhiy.storchaka', 'cheryl.sabella', 'miss-islington']
pr_nums = ['13576', '13602', '13678', '14167', '14168']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37039'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[terryjreedy]

Restore Height restores to default, not previous size. This is a bit surprising, but is documented. "Toggles the window between normal size and maximum height. The initial size defaults to 40 lines by 80 chars unless changed on the General tab of the Configure IDLE dialog." AFAIK, this has always been the case.

The switch from 'normal size' to 'initial size' might make this a little less clear than sticking to 'normal'. Also, only height, not width is relevant. It could be noted that 'normal' != 'previous'.

This entry is above the code context entry in the doc, but the changed menu entry is below the code context menu entry (at my request, I believe). Both were moved from the Window menu in bpo-22703. The doc entry needs to be moved down.

Side note: this is an example of where a popup menu hint would be helpful.

I will make a PR.

[aroberge]

As reported on the idle-dev list, on my system (Windows 10, display resolution 3200 x 200, scaling of text at 200% as recommended), the Zoom Height changes the height of the window and Idle's status bar is no longer visible. Clicking on Restore Height does nothing: Idle's window does not return to the default (the size it had when it was open); it stays the same with the status bar either hidden behind the task bar.

[aroberge]

I have tried on another computer (Windows 10, screen resolution 1920 x 1080, text scaling 100%) and it works as expected: clicking on Restore Height restores the window's height to its original value.

Back to the computer where I reported the problem: changing the scaling from 200% to 100% (which makes everything nearly unreadable) does not solve the problem.

Both tests were done with Python 3.7.3 (32 bit).

[terryjreedy]

Andre Roberge reported on idle-dev that Restore Height has no effect for him with Python 3.7.3, 32 bit, on Windows 10. Since it works for me on Win 10, 3.7.3-32 bit local debug build and 3.7.3-64 bit installed and ditto for 3.8, I am initially baffled.

Andre, the only way I know to debug this is for you to add debug prints to zoomheight.py and start IDLE in a console, to see the print output, with 'py -m idlelib' (add -3.7 if needed). The first thing I can think of is 'print(geom)' and 'print(newgeom)' in zoom_height() after they are fetched and defined near the top and bottom.

[terryjreedy]

I have a 27" 2560X1440 screen.  For me:
>>> import tkinter; tkinter.Tk().tk.call('tk', 'scaling')
1.333...

I presume 3200x200 should be 3200x2000 and that the diagonal size is small enough that the screen is a HiDPI screen, making tk's scaling above 1.4, so that run.fix_scaling() adjusts font sizes.

I am not sure what you mean by 'scaling at 100%/200%' other than tk scaling <, >= 1.4 or HiDPI no/yes, or how you changed the scaling. I grepped idlelib for 'scaling' and only found references to the function and the tk call.

In any case, tcl/tk does not properly support HiDPI screens. Serhiy Storchaka contributed fix_scaling to make IDLE readable on a HiDPI Linux laptop. The 1.4 and .75 values are empirical. With help from Windows experts, I added the SetProcessDpiAwareness call near the top of pyshell when a Windows user with a HiDPI screen reported a problem on idledev. I believe that the call tells Windows that IDLE already makes a scaling adjustment, so it should not also do so.

zoomheight.zoom_height() restores by calling top.wm_geometry('').
https://www.tcl.tk/man/tcl8.6/TkCmd/wm.htm#M42 says
"If newGeometry is specified as an empty string then any existing user-specified geometry for window is cancelled, and the window will revert to the size requested internally by its widgets."

This works for normal screens but somehow not for your HiDPI Windows screen. Can you do the print experiment I suggested previously?

I will experiment to see how much '22' needs to be increased for Windows to accomodate the task bar. What is really needed is to determine the size and orientation of the taskbar, or rather the remaining 'full-screen' height.

Serhiy, do you still have a HiDPI screen? If so, does Options => Zoom/Restore Height work for you? Do Linux desktop managers have bottom panels or taskbars that can cover part of a zoomed window?

Ignore any task bar over status bar issue.)

[terryjreedy]

Tal, how is zoom/restore height working on your Mac?

On my updated Macbook Air Mohave, the zoom bottom margin of 88 is too large. Since IDLE starts fully zoomed on this small screen, I determined this by shrinking Shell and then zooming it. The result leaves a margin between IDLE and the app panel, which goes away when restoring to initial state. But I want to know if 88 is too large on other machines before I change it.

[terryjreedy]

The current patch fixed the hidden status bar on Windows. I just had to increase the margin reserved for the taskbar from 76 to 114. This will also work if the taskbar is moved to the top of the screen. If the taskbar is moved to either side or if it is less high for previous versions of Windows, a visible margin is better than a hidden status bar.

[aroberge]

Thanks.

I did a quick check. 114 solves the problem of the Restore Height not
working, but the status bar is still hidden. To me, the crucial part of
the problem was the restore height not working, so I'd be happy with this.

At 164, I can see parts of the status bar
[image: image.png]

At 180, there is a tiny gap

[image: image.png]

178 seems to be just touching.

[image: image.png]

With the vertical resolution of my screen being 2000 px, tiny gaps are
essentially invisible. Because of this huge resolution, most display
elements (text, icons ... and the taskbar) are set up to be twice as big -
this is the 200% factor I was referring to. So, in pixel terms, the taskbar
on my computer is likely twice as high as yours.

Using a measuring tape, the physical size of my screen is 183 mm; the
taskbar is 8 mm high.

I can add these comments (and screenshots?) on the bug tracker if you'd
like.

Thanks for finding the solution to this problem.

André

P.S. I *just* started using IDLE again as I want to use it as a basis for
my project. The last time I had used IDLE was with Python 2.4 - I quickly
moved on to using other editors. There's been tremendous progress since and
I want to thank you for all your work.

On Sat, May 25, 2019 at 7:11 PM Terry J. Reedy <report@bugs.python.org>
wrote:

Terry J. Reedy <tjreedy@udel.edu> added the comment:

The current patch fixed the hidden status bar on Windows. I just had to
increase the margin reserved for the taskbar from 76 to 114. This will
also work if the taskbar is moved to the top of the screen. If the taskbar
is moved to either side or if it is less high for previous versions of
Windows, a visible margin is better than a hidden status bar.

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Python tracker <report@bugs.python.org>
<https://bugs.python.org/issue37039\>

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