Fix calculating the position of the keyboard in ComposeContentViewController (#909)

Co-authored-by: Marcus Kida <marcus.kida@bearologics.com>

MastodonSDK/Sources/MastodonUI/Scene/ComposeContent/ComposeContentViewController.swift

@@ -207,7 +207,15 @@ extension ComposeContentViewController {
             self.tableView.contentInset.bottom = padding - self.view.safeAreaInsets.bottom
             self.tableView.verticalScrollIndicatorInsets.bottom = padding - self.view.safeAreaInsets.bottom
             UIView.animate(withDuration: 0.3) {
-                self.composeContentToolbarViewBottomLayoutConstraint.constant = endFrame.height
+                // ref: https://developer.apple.com/documentation/uikit/uiresponder/1621578-keyboardframeenduserinfokey
+                let localKeyboardFrame = self.view.convert(endFrame, from: self.view.window!.screen.coordinateSpace)
+                let intersection = self.view.bounds.intersection(localKeyboardFrame)
+                if intersection.isEmpty {
+                    self.composeContentToolbarViewBottomLayoutConstraint.constant = 0
+                } else {
+                    self.composeContentToolbarViewBottomLayoutConstraint.constant = self.view.bounds.maxY - intersection.minY
+                }
+                
                 self.view.layoutIfNeeded()
             }
         })