Bug Report - Issue with dark theme No 2

[jourmager]

Cosmetic bug.

1. Environment: such as in Issue with dark theme No 1

2. Steps to Reproduce:
   2a) Open Scan Tailor Deviant with default settings
   2b) Change applicaton style and application stylesheet to dark theme:
   Menu -> Tools -> Settings -> General -> Options -> Application style -> windowsvista (or windows, or fusion)
   Menu -> Tools -> Settings -> General -> Options -> Application stylesheet -> BreezeDark
   2c) Perform standard image processing steps: Fix Orientation, Split Pages, Geometric Distortions, Page Layout ... (doesn't matter)

3. Expected Result:
   The frame line will be in the middle of the letters.

4. Actual Result:
   The frame line is at the level of the upper border of the lowercase letters.

5. Screenshot: left to right:
   Scan Tailor Deviant windowsvista BreezeDark, Scan Tailor Deviant windowsvista dark_blue, Scan Tailor Universal windows BreezeDark, ScanTailor Advanced Dark color sceme
   

6. Additional Information:
   6a) Scan Tailor Deviant has the same bug in Application stylesheets such as: Breeze, Standard (less visible), Ubuntu (less visible)
   6b) Scan Tailor Universal has no frame at all, and therefore there is no such bug, but the lack of a frame can lead to poor readability of the interface, since there will be no division into a group of control elements on Page Layout and Output stages.
   6с) ScanTailor Advanced has a black frame on a very dark background, which makes it difficult to distinguish between groups of controls on Page Layout and Output stages.

7. Additional information not related to this topic:
   7a) The light orange and green colors for the control arrows (Scan Tailor Deviant and Universal) seem like a questionable choice because they contradiction with the strict dark style.
   7b) The header "Scope" on Fix Orientation and Select Content stages seems like an unnecessary interface element because in later stages it may not exist at all.