After set body display: flex;justify-content: center;align-items: center;, the page is cuted off some on the top. Why?

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Summary The issue occurs when applying display: flex; with justify-content: center; and align-items: center; to the <body> element, causing the page content to be vertically and horizontally centered, but also introducing unexpected vertical whitespace at the top. This results in the page appearing “cut off” on larger screens. Root Cause Flexbox on <body>: The <body> … Read more

How to parse informal Persian number words into an integer currency value (Rial)

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Summary A production incident occurred in a Persian‑language financial application where informal Persian number words were parsed incorrectly, producing wrong integer Rial values. The failure stemmed from ambiguous colloquial forms, mixed units (تومان/ریال), and inconsistent tokenization rules. The system behaved unpredictably when users combined spoken‑style numerals, misspellings, and magnitude units in the same sentence. Root … Read more

HTML Canvas Drawing Works on Desktop But Not Mobile

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Summary A signature‑capture canvas worked flawlessly on desktop but failed to register touch drawing on mobile Safari. The canvas rendered correctly, but touch events never produced usable coordinates, resulting in no visible strokes. Root Cause The underlying issue was incorrect handling of touch events on iOS Safari, specifically: Using touches instead of changedTouches during touchend … Read more

How can I make a recursive function return an array of a given number set to zero?

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Summary The issue stems from incorrectly using push within a recursive function, causing the array to be modified in place rather than returned as expected. The function returns undefined instead of the accumulated array. Root Cause Misuse of push: numberList.push(n) modifies the array but returns the new length, not the array itself. Missing return statement: … Read more

PPO performance drops drastically when reducing observation from 180-dim lidar to 12-dim handcrafted state (Flappy Bird)

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Summary PPO performs dramatically better with a 180‑dimensional lidar observation because the high‑dimensional signal implicitly encodes temporal information, geometry, and future hazard structure, while the handcrafted 12‑dimensional state removes those cues. The agent is not failing because the state is small — it is failing because the compact state removes the features PPO relies on … Read more

“How to Remove Watermark in Gemini Code Assist on VS Code?”

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Summary The issue involves Gemini Code Assist in VS Code splitting panels and displaying a persistent watermark, despite attempts to merge panels and remove it. The root cause lies in default VS Code settings and Gemini’s integration behavior. Root Cause Panel Splitting: Gemini Code Assist defaults to a split-panel view for code assistance, which cannot … Read more

Flutter ListTile.trailing alignment issue: DropdownButton shifts position with Switch

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Summary This incident documents a subtle but persistent alignment drift between a Switch and a DropdownButton placed in the trailing slot of a Flutter ListTile. Even with fixed-width containers, centering, and padding removal, the dropdown’s horizontal position shifts while the switch remains stable. The behavior stems from intrinsic sizing differences, baseline alignment rules, and internal … Read more

MSYS2 -mcmodel=large and exceptions

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Summary This postmortem analyzes why a simple C++ program that throws and catches a std::runtime_error works normally under MSYS2, but fails with terminate() when compiled using -mcmodel=large. The failure is rooted in ABI mismatches and unsupported memory models in the MinGW-w64 runtime. Root Cause The large code model is not supported or fully implemented in … Read more

Why does my code run without errors but still not display the expected output?

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Summary The issue of code running without errors but not displaying the expected output is a common problem faced by many programmers, especially beginners. Incorrect variable assignments, logic errors, and unhandled exceptions are some of the key reasons behind this issue. In this article, we will delve into the root cause of this problem, its … Read more

Python TwitchIO Not connecting to channel. _websockets variable is an empty Dict

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Summary This incident involved a TwitchIO-based chat bot that never actually joined the target Twitch channel, even though no errors were raised. The clearest symptom was that self._websockets remained an empty defaultdict(dict), meaning no IRC websocket connection was ever established. As a result, the bot silently ran but never received chat messages. Root Cause The … Read more