RasterLayerStyling Panel changes color stretch without being (t)asked for

[jakimowb]

The raster layer styling panel often changes the color stretch without it being desired. This quickly ruins painstakingly adjusted render settings.

How to reproduce:

1. Open example data
2. Select the EnMAP layer and open the raster layer styling panel for
3. Change Min/Max Value settings from "user defined" to "Cumulative count cut". This is the renderer we like to keep.
4. Select the aerial_potsdam layer, either in the layer tree or Raster Layer Styling panel combobox
   => this changes the the Min/Max Value settings back to "User defined" and the aerial_potsdam renderer. Why?
5. Now select the enmap_potsdam layer.

As a general rule: Never change a renderer without being asked, i.e. without an interaction between user and raster layer panel

A similar problem

1. Open example data
2. Select the EnMAP layer and open the raster layer styling panel for
3. Select the aerial_postdam layer to switch the raster layer styling for
4. Change Min/Max Value settings to "current canvas" and "Cumulative count cut"
5. Select the EnMAP layer again. Band selection changes to 3-2-1, showing a dark EnMAP raster in the background.

[janzandr]

4. Select the aerial_potsdam layer, either in the layer tree or Raster Layer Styling panel combobox
=> this changes the the Min/Max Value settings back to "User defined" and the aerial_potsdam renderer. Why?

This is a bug.

[janzandr]

5. Select the EnMAP layer again. Band selection changes to 3-2-1, showing a dark EnMAP raster in the background.

Also a bug.