Invisible search configuration icons

[per1234]

Describe the problem

🐛 If the user has used a previous version of the IDE, the "Match Case", "Match Whole Word" and "Use Regular Expressions" icons in the "Search" field of the "Search" sidebar are invisible on first run of the IDE.

They become visible after opening an additional IDE window (e.g., File > New).

To reproduce

1. Delete the IDE's configuration folders.
2. Start Arduino IDE 2.0.0-beta.11.
3. Close all Arduino IDE 2.0.0-beta.11 windows.
4. Start Arduino IDE 2.0.0
5. Click the magnifying glass icon ("Search") on the left menu bar.
   🐛 Note that the "Match Case", "Match Whole Word", and "Use Regular Expressions" search configuration icons are not visible in the "Search" field.
   Hover and click the mouse in the areas where the icons normally are to verify that they do exist.
   🐛 Note that the "Include Ignored Files" configuration icon is the old representational style.
   
6. Select File > New from the Arduino IDE menus.
7. Click the magnifying glass icon ("Search") on the left menu bar.
   🙂 Note that the "Match Case", "Match Whole Word", and "Use Regular Expressions" search configuration icons are now visible in the "Search" field.
   🙂 Note that the "Include Ignored Files" configuration icon is the new abstract style.
   

Expected behavior

Search configuration icons are always visible.

Arduino IDE version

Original report

2.0.0-beta.12-nightly.20211028

Last verified with

2.0.1-snapshot-61a11a0

Operating system

Windows

Operating system version

10

Additional context

The issue does not affect the equivalent icons in the "Find" interface.

Somewhat resembles #531, but that bug is persistent.