Scaling combo text according to zoom level

[ShahzaibIbrahim]

Registering the comboDpiChange handler and applying change manually to
text, image and arrow

Contributes to #62 and #127

HOW TO TEST (Windows only!)

• Run the CustomControlExample with the following VM Arguments

-Dswt.autoScale=quarter
-Dswt.autoScale.updateOnRuntime=true

• Switch to the tab "CCombo"
• Move the window from 100 to 200 zoom level monitor
• See if scales properly

EXPECTED BEHAVIOUR

Combo list, text and arrow should be properly scaled.

[github-actions]

Test Results

   470 files  ±0     470 suites  ±0   7m 33s ⏱️ -43s
 4 135 tests ±0   4 127 ✅ ±0   8 💤 ±0  0 ❌ ±0 
16 336 runs  ±0  16 244 ✅ ±0  92 💤 ±0  0 ❌ ±0 

Results for commit a4979ae. ± Comparison against base commit 5cdf331.

♻️ This comment has been updated with latest results.

[fedejeanne]

@ShahzaibIbrahim the code looks OK but I tested and found out that the elements of the list are displayed far away from the combo.

Can you please look into that?

[ShahzaibIbrahim]

Can you please look into that?

@fedejeanne I have fixed the issue. Could you please check it again in both cases? (100 -> 200) and (200 ->100)

[fedejeanne]

I tested it and it looks fine. I just have a question regarding the moving of the class outside of the package internal

[HeikoKlare]

In general, the changes look good. The comments of Andreas and me should be rather easy to address.

[HeikoKlare]

@fedejeanne please check if you still request changes or may drop your change request

My comments were addressed, thank you!