Godot: Tileset Editor scroll not appearing / working

[yesitsmattharris]

Godot version:
3.1 stable

OS/device including version:
Mac 10.14.4 Mojave

Issue description:
Tile Editor scrollbar doesn't appear until zoom in / out has been clicked, regardless of whether there is content out of view

Steps to reproduce:

1. Create a tilemap and load any tileset
2. Click on the tileset to bring up the tileset editor
3. Select a / the only texture (ensure the texture is large enough to be scrollable)
4. Click on the main window of the tileset editor (click to expand if not expanded) and try to scroll - scroll doesn't work and scrollbar doesn't appear in expanded mode
5. Click on the zoom in or zoom out button - scrollbar appears and will now work (temporarily)

Minimal reproduction project:
tileset.zip

1. Open scene.tscn
2. Click on Tilemap node and then on the tileset to bring up the tileset editor
3. Zoom in so the scrollbar appears
4. Click on the Node2D node and repeat steps 1 and 2.
5. Scrollbar doesn't appear or work.

[yesitsmattharris]

Doesn't seem to want to replicate on a new project, but it happens in my existing projects:

No scrollbar:

Scrollbar after editing zoom and returning to previous zoom level:

[clayjohn]

Please provide a minimal reproduction project so contributors can test it.

If you can't repro from a blank project then neither will others.

Thank you!

[yesitsmattharris]

Hi @clayjohn - I've added a minimal reproduction project and additional steps in how to reproduce the bug within it. Thanks!

[KoBeWi]

I tried reproducing it with the provided project and it doesn't seem to happen. Can someone affected confirm it?

[jbwyatt4]

Posted a video detailing the steps and what to look for.

https://www.youtube.com/watch?v=aVdYAdoVw9U

[jbwyatt4]

I am looking at possibly solving this.

Where is the code for the 'Expand Bottom Panel' button?

I already have the repo downloaded and compiled.

[akien-mga]

Where is the code for the 'Expand Bottom Panel' button?

The simplest way to find it is to use a grepping tool:

$ rg "Expand Bottom Panel"
editor/editor_node.cpp
6206:   bottom_panel_raise->set_shortcut(ED_SHORTCUT("editor/bottom_panel_expand", TTR("Expand Bottom Panel"), KEY_MASK_SHIFT | KEY_F12));

Then search in this file for other occurrences of bottom_panel_raise and editor/bottom_panel_expand.