1) Added support for dynamic tab size. Fixes #4231

2) Fixed an issue where a long file name is not visible on the process watcher dialog. Fixes #5950

web/migrations/versions/81c7ffeffeee_.py

@@ -0,0 +1,46 @@
+
+"""empty message
+
+Revision ID: 81c7ffeffeee
+Revises: 398697dc9550
+Create Date: 2020-11-02 09:46:51.250338
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from pgadmin.model import db, Preferences
+
+
+# revision identifiers, used by Alembic.
+revision = '81c7ffeffeee'
+down_revision = '398697dc9550'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    """
+    Delete older preferences open new tab for Query tool, Debugger,
+     and Schema diff.
+    """
+    qt_open_tab_setting = Preferences.query.filter_by(
+        name='new_browser_tab').order_by(Preferences.id.desc()).first()
+    debugger_tab_setting = Preferences.query.filter_by(
+        name='debugger_new_browser_tab').order_by(Preferences.id.desc()).first()
+    schema_diff_tab_setting = Preferences.query.filter_by(
+        name='schema_diff_new_browser_tab').order_by(
+        Preferences.id.desc()).first()
+
+    if qt_open_tab_setting:
+        db.session.delete(qt_open_tab_setting)
+    if debugger_tab_setting:
+        db.session.delete(debugger_tab_setting)
+    if schema_diff_tab_setting:
+        db.session.delete(schema_diff_tab_setting)
+
+    db.session.commit()
+
+
+def downgrade():
+    # pgAdmin only upgrades, downgrade not implemented.
+    pass