Fix Dropdown icon inconsistencies in all themes

[yradoeva]

Is your feature request related to a problem? Please describe.

Due to inconsistencies in terms of usage of the dropdown icon, we'd like to propose the following design improvement.

Describe the solution you'd like

Material, Fluent & Bootstrap
Change the “arrow_drop_down” icon to “keyboard_arrow_down” icon (resp. “arrow_drop_up” icon to “keyboard_arrow_up” icon) in the following components:

Material

1. Export button in the Grid toolbar
   

2. Value Fields Cell (Chip) in the Pivot Grid
   

Fluent

1. Combo
   

2. Select
   

3. Export button in the Grid toolbar
   

4. Value Fields Cell (Chip) in the Pivot Grid
   

Bootstrap

1. Combo
   

2. Select
   

3. Export button in the Grid toolbar
   

4. Value Fields Cell (Chip) in the Pivot Grid
   

Indigo
Change the “arrow_drop_down” icon to “indigo-chevron-down” icon (resp. “arrow_drop_up” icon to “indigo-chevron-up” icon) in:

1. Combo
   

2. Select
   

3. Export button in the Grid toolbar
   

4. Value Fields Cell (Chip) in the Pivot Grid