Updating raster single-band min/max method does not update actual min/max

[qgib]

Author Name: Dewey Dunnington (@paleolimbot)
Original Redmine Issue: 18705
Affected QGIS version: 3.0.0
Redmine category:osx_ui

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When updating the min/max method for single band (pseudocolor and grayscale), updating the manual min/max values will change the method to "User defined", but changing the method type to something else (min/max, mean +/-) does not update the min/max values until the "Apply" or "OK" is clicked on the user dialog. Clicking "Classify" doesn't do anything. Is this intentional? I think there used to be a "calculate" button here? It took me a while to figure out the fix...

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• Screen Shot 2018-04-10 at 4.33.00 PM.png (Dewey Dunnington)
• Screen Shot 2018-04-11 at 1.52.21 PM.png (Dewey Dunnington)

[qgib]

Author Name: Alessandro Pasotti (@elpaso)

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Can you please check how (and if) it was working in 2.x?

If this is a regression introduced in 3.x, please flag it.

What is the expected behavior here?

I think that the "Classify" button should recalculate the values whenever pressed...

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• assigned_to_id was configured as Alessandro Pasotti

[qgib]

Author Name: Alessandro Pasotti (@elpaso)

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Small update testing on Linux, if I manually change Min or Max values this is what happens:

• User defined is automatically selected
• The values are automatically recalculated

this looks like (another) OSX issue, sorry but I cannot help.

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• assigned_to_id removed Alessandro Pasotti

[qgib]

Author Name: Dewey Dunnington (@paleolimbot)

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This is not an OSX issue, this is a QGIS 3 issue. Updating the min/max values manually will automatically change the min/max method type, but changing the min/max method type does not automatically change the min/max values unless the "Apply" or "OK" is clicked. In QGIS 2, there was a "Load" button that performed this operation. This is a problem for both grayscale and pseudocolor singleband representations.

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• assigned_to_id was configured as Alessandro Pasotti
• 12595 was configured as Screen Shot 2018-04-11 at 1.52.21 PM.png

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• Screen Shot 2018-04-11 at 1.52.21 PM.png (Dewey Dunnington)

[qgib]

Author Name: Alessandro Pasotti (@elpaso)

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• assigned_to_id removed Alessandro Pasotti

[qgib]

Author Name: Alessandro Pasotti (@elpaso)

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ok, got it.
The load button is gone.

Apparently by design:

commit 407991e
Author: nirvn nirvn.asia@gmail.com
Date: Tue Dec 27 14:43:26 2016 +0700

[ui] rename the min/max widget group box title
Since there is no more loading involved through
the min/max widget, rename it to:
"Min /max values settings"

[qgib]

Author Name: Dewey Dunnington (@paleolimbot)

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No problem with a Load button that doesn't exist, provided that there is a way to change from a manually entered min/max to a calculated min/max. The "load" operation is fired when "Apply" is clicked, but could also be fired when the user changes any of the options for the Min/Max settings (e.g., different +/- standard deviation, change to min/max from user defined). At the very least, I feel like it should be fired when the user clicks "classify" in the pseudocolor section.

[Pedro-Murteira]

Still valid on QGIS 3.22.3. on Windows 10.