Initial shift+space swipe to select impl

NOTE: Currently sets selection start as the 'anchor' point and then
moves selection start around. This is different to delete swipe which
moves around selection start. Is the behaviour of moving selection start
around with a fixed selection end preferable?

NOTE: many issues to fix.

app/src/main/java/helium314/keyboard/keyboard/KeyboardActionListenerImpl.kt

@@ -32,6 +32,7 @@ class KeyboardActionListenerImpl(private val latinIME: LatinIME, private val inp
             KeyCode.ALT -> KeyEvent.META_ALT_ON
             KeyCode.FN -> KeyEvent.META_FUNCTION_ON
             KeyCode.META -> KeyEvent.META_META_ON
+            KeyCode.SHIFT -> KeyEvent.META_SHIFT_ON
             else -> return
         }
         metaState = if (remove) metaState and metaCode.inv()
@@ -213,6 +214,20 @@ class KeyboardActionListenerImpl(private val latinIME: LatinIME, private val inp
             }
         }
 
+        //NOTE: Delete swipe moves the selStart back before end, should I change to move start instead to be aligned?
+        //TODO: when holding to set/unset capslock it will act like shift is held. isn't calling releaseKey() thus adjustMetaState(shift, true)
+        //TODO: moving after selection always happens from right, should be from left when swiping back, right when swiping forward.
+        //TODO: stop recapitalisation from happening every time.
+        //TODO: gets broken by the manual fallback movement over emoji and when swiping to the end/start because move_steps=0.
+        //TODO: when selEND is left and selStart is at end of text, then move selEND right it deselects and other way too.
+        //      Maybe get text after cursor is reading from start.
+        //DONE: recapitalisation will be broken when performing on a backwards selection. !DONE
+
+        val anchor = inputLogic.mConnection.expectedSelectionStart
+        val newPosition = inputLogic.mConnection.expectedSelectionEnd + moveSteps
+
+        val isShiftPressed = metaState and KeyEvent.META_SHIFT_ON != 0
+
         // the shortcut below causes issues due to horrible handling of text fields by Firefox and forks
         // issues:
         //  * setSelection "will cause the editor to call onUpdateSelection", see: https://developer.android.com/reference/android/view/inputmethod/InputConnection#setSelection(int,%20int)
@@ -225,14 +240,20 @@ class KeyboardActionListenerImpl(private val latinIME: LatinIME, private val inp
         if (variation != 0 && inputLogic.moveCursorByAndReturnIfInsideComposingWord(moveSteps)) {
             // no need to finish input and restart suggestions if we're still in the word
             // this is a noticeable performance improvement when moving through long words
-            val newPosition = inputLogic.mConnection.expectedSelectionStart + moveSteps
+            if(isShiftPressed) {
+                inputLogic.mConnection.setSelection(anchor, newPosition)
+            } else {
                 inputLogic.mConnection.setSelection(newPosition, newPosition)
+            }
             return true
         }
 
         inputLogic.finishInput()
-        val newPosition = inputLogic.mConnection.expectedSelectionStart + moveSteps
+        if(isShiftPressed) {
+            inputLogic.mConnection.setSelection(anchor, newPosition)
+        } else {
             inputLogic.mConnection.setSelection(newPosition, newPosition)
+        }
         inputLogic.restartSuggestionsOnWordTouchedByCursor(settings.current, keyboardSwitcher.currentKeyboardScript)
         return true
     }