keys/views: Add ExceptionView class and COPY_TRACEBACK key.

Added ExceptionView class that allows users to copy traceback from
the exception has occured popup with a newly introduced hotkey 'c'
(COPY_TRACEBACK).

Author: rsashank

docs/hotkeys.md

@@ -9,6 +9,7 @@
 |Show/hide Markdown Help Menu|<kbd>Meta</kbd> + <kbd>m</kbd>|
 |Show/hide About Menu|<kbd>Meta</kbd> + <kbd>?</kbd>|
 |Copy information from About Menu to clipboard|<kbd>c</kbd>|
+|Copy traceback from Exception Popup to clipboard|<kbd>c</kbd>|
 |Redraw screen|<kbd>Ctrl</kbd> + <kbd>l</kbd>|
 |Quit|<kbd>Ctrl</kbd> + <kbd>c</kbd>|
 |New footer hotkey hint|<kbd>Tab</kbd>|

tools/lint-hotkeys

@@ -23,7 +23,7 @@ SCRIPT_NAME = PurePath(__file__).name
 HELP_TEXT_STYLE = re.compile(r"^[a-zA-Z /()',&@#:_-]*$")
 
 # Exclude keys from duplicate keys checking
-KEYS_TO_EXCLUDE = ["q", "e", "m", "r", "Esc"]
+KEYS_TO_EXCLUDE = ["q", "e", "m", "r", "Esc", "c"]
 
 
 def main(fix: bool) -> None:

zulipterminal/config/keys.py

@@ -56,6 +56,12 @@ class KeyBinding(TypedDict):
         'help_text': 'Copy information from About Menu to clipboard',
         'key_category': 'general',
     },
+    'COPY_TRACEBACK': {
+        'keys': ['c'],
+        'help_text': 'Copy traceback from Exception Popup to clipboard',
+        'excluded_from_random_tips': True,
+        'key_category': 'general',
+    },
     'EXIT_POPUP': {
         'keys': ['esc'],
         'help_text': 'Close popup',

zulipterminal/ui_tools/views.py

@@ -1076,6 +1076,24 @@ def __init__(
         super().__init__(controller, widgets, "EXIT_POPUP", width, title)
 
 
+class ExceptionView(NoticeView):
+    def __init__(
+        self,
+        controller: Any,
+        notice_text: Any,
+        width: int,
+        title: str,
+        traceback: str,
+    ) -> None:
+        self.traceback = traceback
+        super().__init__(controller, notice_text, width, title)
+
+    def keypress(self, size: urwid_Size, key: str) -> str:
+        if is_command_key("COPY_TRACEBACK", key):
+            self.controller.copy_to_clipboard(self.traceback, "Traceback")
+        return super().keypress(size, key)
+
+
 class AboutView(PopUpView):
     def __init__(
         self,