Merging 6.2.x into master (#3012)

* feat(grid, chip): add display density DI token to igxGrid and igxChip

* Resolving confilcts related to the new structure(grids ->grid)

* Fixing styling issue

* Adding event arguments for DenistyChanged

* Renaming IDisplayDenisty to IDisplayDenistyOptions and setting IDensityChangedEventArgs type to be DisplayDenisty

* Trigger onDensityChanged only for components that do not have displayDenisty explicitly set when the global denisty is changed

* Adding displayDenisty DI in tree grid constructor

* Group by chips are now affected from the global display denisty option

* fix(igxGrid): dirty check only checks if value exists, #2940

* fix(igx-grid): Open date-picker only if condition is not unary, #2937

* Summaries display denisty classes are now correctly applied

* Removing dsiplayDenisty property since it is not needed any more

* fix(igx-grid): Clear filter when value is cleared from input, #2945

* test(treeGrid): Update treeGrid Keyboard navigation tests #2953

* Improve keyboard navigation in filtering (#2964)

* fix(igx-grid): Improve keyboard navigation in filtering, #2951

* fix(igx-grid): Get scroll from first row, when there is one, #2951

* chore(igx-grid): Refactor code, #2951

* chore(igx-grid): Add cases for groupbyrow and pinned columns, #2951

* chore(igx-grid): Fix lint errors, #2951

* feat(igx-grid): Close filter row on Esc, #2979

* test(igx-grid): Add test, #2979

* chore(*): Merging master into 6.2.x

* Sorting strategy merge 6.2.x (#2998)

* feat(grid sorting): Merging the new sorting strategy into 6.2.x #2734

* chore(*): Adding missing imports to grid-selection tests

* chore(*): More test import fixes

* chore(*): Applying the groupby changes with the new sorting strategy

* chore(*): Resolving the column moving test issue

* chore(*): This should be it with the test fixes

* chore(*): Removing the fdescribe

CHANGELOG.md

@@ -169,6 +169,9 @@ When you focus a specific cell and press one of the following key combinations,
 
 ### General
 
+- `sortStrategy` input exposed to provide custom sort strategy for the `IgxColumnComponent`. The custom strategy should implement the `ISortingStrategy` interface, or can extend the base `SortingStrategy` class and override all or some of its public/protected members.
+- `groupingComparer` input exposed to provide custom grouping compare function for the `IgxColumnComponent`. The function receives two values and should return `0` if they are to considered members of the same group.
+
 ### Bug fixes
 
 - Fix sorting and groupby expression not syncing when there are already sorted columns. #2786