Fix OpenFile, SaveFile, Directory pickers style

[Dmitry-VF]

Description of Change

Fix styles to make it look more even

Issues Resolved

• fixes #

API Changes

None

Platforms Affected

• All
• WPF
• UWP
• iOS
• Android

Behavioral Changes

None

Testing Procedure

PR Checklist

• [ ] I have included examples or tests
• [ ] I have updated the change log
• [ ] I am listed in the CONTRIBUTORS file
• [ ] Rebased on top of the target branch at time of PR
• [ ] Changes adhere to coding standard

[ceo1647]

I found a problem with margins in SaveFilePicker (but i think the same problem may be in Open/Directory pickers.. need to check) If labelWidth = 0 looks like the margins on label should be 0 when LabelWidth is 0

[ceo1647]

another one is we have to add DefaultOpenFile/Directory/SaveFilePickerStyle and set default margins ...also i recommend set Height to {DynamicResource Size.Height}; like here: but in a Default styles as for all other controls

[ceo1647]

[ceo1647]

Suggestion, maybe it's better to set default LabelWidth value to 0... as for me it's ugly solution, because you'll never get it right: It's better to have Label separately from Picker control, then it's easier to adjust margins in a grid

[ceo1647]

Another suggestion, but for other task -> as we working on OpenFilePicker/SaveFilePicker/Directory picker ... there is a lot of extra code here because we use MVVM approach here and controls are not extendable (changed control template, styles, attached events etc); so created issue for it https://sesolutions.atlassian.net/browse/ORCOMP-657

[GeertvanHorrik]

The buttons don't seem square?