Weird interval QgsDoubleSpinbox behavior in graduated symbology with fixed interval

[nicogodet]

What is the bug or the crash?

Might be linked to wrong locale interpretation

Steps to reproduce the issue

1. Define graduated symbology on vector layer
2. Choose fixed interval
3. Select everything
4. Type what you want

Versions

3.28.3

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[elpaso]

What's exactly the issue here?

The only thing I notice from your clip is 0.3,000 which is invalid and becomes 0.

[nicogodet]

Okay so :

First try

I select all

Type 0.3

Here, remains ,000000 while on any other spinbox it's not the case
It leads to invalid value

Ex X, Y shift in symbology

Second try

After first try and invalid value, it is all selected in spinbox

Type 0.3



See auto conversion of . to ,

Select all and press del

shows default value as hint (?)

Start typing 0.3

default grayed out value is added after first 0

Ends in invalid value and default to previous valid valid which was 1,0

Third try

After second try and invalid value, it is all selected in spinbox

Type 2


OK

Fourth try

After third try, it is all selected in spinbox
Hit del

See cursor at beginning and grayed out default value
Type 5 then enter. I thought it would erase default value as it is grayed out

Nope 51

it all selected, type 32


Hit del

Hit 6

The behavior is confusing
Another screen capture with keyboard

[elpaso]

@nicogodet thank you for the clarification, I misunderstood "select all" with select all the rules, I'll have a look.

[nicogodet]

Side note if you work on this panel

Precision spinbox won't expand if clear button is on

[elpaso]

@nicogodet I debugged the issue: it seems to me that the problem is caused by the immediate call to the classification code every time the value in the input box changes, this runs in the main thread and blocks the GUI messing with the input processing in the input box.

I will provide a PR with a timer implementation (0.5 sec) which will trigger the classification only when 0.5 sec are passed from the last change in the input box.

This fixes (or at least mitigates) the issue for me but I'd like you to test it.

[elpaso]

Side note if you work on this panel

Precision spinbox won't expand if clear button is on

Can you please file a separate ticket?

[nicogodet]

Thanks @elpaso
I will test when mingw build is completed

Can you please file a separate ticket?

OK

[nicogodet]

It helps to avoid 0.3,000000

Is it not possible to have the behavior as for X or Y shift ?

Which keep the user value until he press enter or spinbox lose focus ?